September Weather in South Valley, United States

Last updated: June 24, 2025

In September, the average temperature in South Valley, United States is a pleasant 22°C (72°F). Temperatures can range from a cool 5°C (41°F) to a warm 35°C (95°F). Expect approximately 24 mm (0.9 in) of precipitation over 2 days, with an average humidity of 72%.

September Temperature in South Valley

In September in South Valley, the average temperature is 22°C (72°F), with maximums reaching 35°C (95°F) and minimums dropping to as low as 5°C (41°F). This wide temperature range makes it essential for travelers to pack both light clothing for the warm days and warmer layers for the cooler evenings.

September Weather in South Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Valley, September typically has an average temperature of 22°C (72°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (41°F).

Data source: Temperature data for South Valley generated using information from the Copernicus Climate Change Service.

September Precipitation in South Valley

In South Valley in September, the total precipitation amount is 24 mm (0.9 in) over a period of 2 days.

September Precipitation Trends in South Valley

The chart displays monthly precipitation patterns in South Valley, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In South Valley, September typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 2 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in South Valley

In South Valley in September humidity is 72%. With an average temperature of 22°C (72°F), this humidity feels like you are stepping into a warm, embracing blanket, making traveling feel sweaty and slightly stifling, but the balmy weather is also quite perfect for exploring local attractions.

September Average Humidity in South Valley

This chart illustrates the average monthly humidity levels in South Valley, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in South Valley is approximately 72%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Valley

In South Valley in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in South Valley.

Maximum UV Index Levels in South Valley for September

The chart shows the monthly maximum UV Index (UVI) for South Valley in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in South Valley typically reaches 11, which falls under the extreme exposure category.

Data source: South Valley September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in South Valley Compares to Other Months

Weather in South Valley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in South Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in South Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	16 mm (0.6 inches)	78%	moderate
February Weather	5°C (41°F)	17 mm (0.7 inches)	79%	high
March Weather	10°C (50°F)	13 mm (0.5 inches)	66%	very high
April Weather	15°C (59°F)	14 mm (0.6 inches)	60%	extreme
May Weather	20°C (68°F)	8 mm (0.3 inches)	57%	extreme
June Weather	25°C (78°F)	10 mm (0.4 inches)	55%	extreme
July Weather	26°C (80°F)	24 mm (0.9 inches)	56%	extreme
August Weather	26°C (78°F)	11 mm (0.4 inches)	65%	extreme
September Weather	22°C (72°F)	24 mm (0.9 inches)	72%	extreme
October Weather	14°C (58°F)	24 mm (1.0 inches)	78%	very high
November Weather	8°C (47°F)	14 mm (0.6 inches)	81%	moderate
December Weather	3°C (38°F)	11 mm (0.4 inches)	79%	moderate